A093599 Composite numbers having an odd number of prime factors, all of which are distinct.

30, 42, 66, 70, 78, 102, 105, 110, 114, 130, 138, 154, 165, 170, 174, 182, 186, 190, 195, 222, 230, 231, 238, 246, 255, 258, 266, 273, 282, 285, 286, 290, 310, 318, 322, 345, 354, 357, 366, 370, 374, 385, 399, 402, 406, 410, 418, 426, 429, 430, 434, 435

Offset

1,1

Comments

First differs from A007304 at 2*3*5*7*11 = 2310, which is a(360) and thus beyond the tabulated range.

Subsequence of A030059. - Bill McEachen, Nov 06 2020

Links

Carl R. White, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Prime Sums

Wikipedia, Moebius function

Mathematica

Select[Range[435], MoebiusMu[ # ] == -1 && Not[PrimeQ[ # ]] &] (* Alonso del Arte, Jan 24 2005 *)

Prog

(PARI) is(n)=my(f=factor(n)[, 2]); #f>2 && #f%2==1 && vecmax(f)==1 \\ Charles R Greathouse IV, Oct 19 2015

Crossrefs

Cf. A007304, A030059.

Sequence in context: A225228 A336568 A350352 * A007304 A160350 A053858

Adjacent sequences: A093596 A093597 A093598 * A093600 A093601 A093602

Keyword

nonn

Author

Eric W. Weisstein, Apr 03 2004

Status

approved